Add testCase for explicit return type
Add testCase for explicit return type

vpg/zephir,vpg/zephir,zephir-lang/zephir,vpg/zephir,zephir-lang/zephir,phalcon/zephir,zephir-lang/zephir,zephir-lang/zephir,vpg/zephir,phalcon/zephir,phalcon/zephir,vpg/zephir,phalcon/zephir,phalcon/zephir,zephir-lang/zephir,vpg/zephir,phalcon/zephir